MODEL LINEAGE
中文
Model index
OpenAI·GPT

GPT-5.5

A 1M-context frontier model for complex knowledge work, computer use, coding, and scientific research.

LegacyLanguageReasoningCodingAgentMultimodalWeights not released
MODEL NUMBER064
First public date
2026-04-23
Organization
OpenAI
Family
GPT
01

Specifications

Only published specifications are shown.

Context
1,050,000 tokens↗
Maximum output
128,000 tokens↗
Input modalities
Text · Image
Open weights
No
Status
Legacy
02

Overview

Release dates

— GPT-5.5 launched in ChatGPT and Codex. ↗ — GPT-5.5 and GPT-5.5 Pro became available in the API. ↗

03

Specifications alongside predecessor

Compared with GPT-5.4 ↗

PreviousGPT-5.4— · 1.05M ctx
CurrentGPT-5.5— · 1.05M ctx
04

Architecture & capabilities

Model capabilities

Long-horizon agentCodingScientific research

Connected tools

Computer use
05

Release history

General release

GPT-5.5 launched in ChatGPT and Codex.

View source
API launch

GPT-5.5 and GPT-5.5 Pro became available in the API.

View source
06

Related models

Select a card to view the related model.

PredecessorGPT-5.4View details →SuccessorGPT-5.6View details →VariantGPT-5.5 InstantView details →
07

Sources

01
Introducing GPT-5.5OpenAI · Published 2026-04-23
Official · Verified02
OpenAI API model specificationsOpenAI · Checked 2026-09-07
Official · Verified
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